Pack of two, Protected 14500 Li-ion Rechargeable Battery P1450C3 Typical Capacity: 1100mAh (Min. Capacity: 1050mAh) Nominal Voltage: 3.6V/3.7V In Built Safety Circuitry (IC made in Japan) Protection Circuit (Against over charge, over discharge, over current and short-circuit.) 4.2 volts max voltage and 2.5 volts cut-off voltage Over 300 charge-discharge cycles Battery Certification : UN38.3, CE, ROHS, MSDS, CCC, Regulation (EU) 2023/1542